Other spoilers include V.A.T.S, a removal card with the extremely strong Split second keyword
Kessig Cagebreakers doesnt fit the wolf or elf typal theme, but it generates Wolf tokens on attack equivalent to however many creature cards are in your graveyard
It joins the ranks of Chulane, Teller of Tales and Helga, Skittish Seer as a generic ramp engine that provides auxiliary value
There are a handful of cards for which this has been completely fine: On the other hand, Wizards of the Coast is likely to be particularly careful on this front, as one of the most recent bans in Modern involved a card theyd previously removed from the banlist, only to have to re-ban it later on: The most difficult aspect of unbanning cards from a parent companys perspective is the cost/benefit analysis associated with taking the risk
There are subcategories within these rarities that make things a bit more complicated, but at the most basic level you can determine rarity at a glance by looking at the symbol to the right of the collector card number